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Bosch AquaStar Model 125 Series Tankless Water Heaters
Technical Information about model 125 Series Water Heaters
Return to Bosch AquaStar Main Page
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Specifications
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Model
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125HX/1600H
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125FX
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125B/125BS
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125BL
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125BO
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Energy Factor
(Natural Gas)
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.80
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.78
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.69
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.69
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.69
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Energy Factor
(Propane Gas)
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.84
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.81
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.79
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.79
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.79
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Efficiency
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82%
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82%
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82%
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82%
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80%
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BTU/input
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117,000
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125,000
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117,000
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117,000
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117,000
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Minimum Flow Rate GPM
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0.5
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0.5
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0.5
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1.8
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0.5
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@ 45° rise
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4.0 GPM
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4.0 GPM
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4.0 GPM
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4.0 GPM
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4.2 GPM
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@ 55° rise
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3.3 GPM
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3.6 GPM
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3.3 GPM
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3.3 GPM
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3.3 GPM
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@ 65° rise
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2.8 GPM
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3.1 GPM
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2.8 GPM
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2.8 GPM
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2.8 GPM
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@ 75° rise
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2.4 GPM
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2.7 GPM
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2.4 GPM
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2.4 GPM
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2.0 GPM
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@ 90° rise
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2.0 GPM
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2.3 GPM
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2.0 GPM
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2.0 GPM
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2.1 GPM
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Flue Size
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5"
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4"
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5"
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5"
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n/a
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Water Inlet
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1/2" NPT
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1/2" NPT
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1/2" NPT
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1/2" NPT
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1/2" NPT
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Gas Inlet Connection
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1/2" NPT
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1/2" NPT
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1/2" NPT
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1/2" NPT
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3/4" NPT
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Min. Natural Gas Line
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3/4" NPT
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3/4" NPT
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3/4" NPT
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3/4" NPT
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1/2" NPT
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Min. LP Gas Line
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5/8"
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5/8"
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5/8"
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5/8"
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3/4"
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Height
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29 3/4"
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29 3/4"
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29 3/4"
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29 3/4"
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36 3/4"
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Width
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18 1/4"
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18 1/4"
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18 1/4"
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18 1/4"
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18 1/4"
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Depth
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8 3/4"
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8 3/4"
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8 3/4"
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8 3/4"
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10 1/2"
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Shipping Weight
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44 lbs
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51 lbs
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44 lbs
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44 lbs
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57 lbs
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Recom. Min. Water Pressure
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18 PSI
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18 PSI
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18 PSI
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18 PSI
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30 PSI
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Max. Water Pressure
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150 PSI
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150 PSI
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150 PSI
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150 PSI
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150 PSI
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Min. LP Gas Pressure
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11" W.C.
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11" W.C.
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11" W.C.
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11" W.C.
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11" W.C.
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Min. Natural Gas Pressure
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7" W.C.
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7" W.C.
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7" W.C.
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7" W.C.
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7" W.C.
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